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2001 300 ex timing question

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I know, I know this has been posted over and over here  probably .. but I couldent find anything about my specific issue .... Ok I bought a 300 ex that was torn apart already with a replated cylinder and piston and such .. anyways im getting the bike back together finally .. Since the cam was out I have no way of knowing if when it was taken apart it was on the compression stroke or not.. I have worked on tons of cars and all " consider me a shade tree" ... Is it possible to have it 180 degrees out ? does the spark plus fire every rotation no matter what .. ?? thanks for any reponses I get .. I have it properly timed and waiting on a manual chain adjuster now ... but I wanna know if the spark pattern can possibly be off or not ...

Edited by waycaster2011
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